list of sources
David Ehrlich (Fri, 09 Jan 2009 11:29:33 PST)

That site doesn't do a very good job.  I looked up Patersonia, as an example; it didn't list any sellers of that genus.  Yet, it did list B&T World Seeds (both Erica patrersonia and  Babiana patersoniae) which happens to sell seed for several species of Patersonia.
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From: Diane Whitehead

http://www.plantnavigator.ch/en/index0.shtml

As of today:
Suppliers: 915
Number of plants: 79,557